Malicious PDF — malware analysis report

Static analysis result for SHA-256 b560b7fdf02a97da…

MALICIOUS

PDF

72.7 KB Created: 2021-09-17 14:33:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: bfb3aa33a5eadb69588cec03f35a643a SHA-1: 91524d3443d64cfc5ec20e75b8c5d84e6f6e0516 SHA-256: b560b7fdf02a97da96df5ea489f3d60aaffbdf1f53383b6d76fafe0db4ce5932
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is identified as malicious by ML classifiers and ClamAV, indicating it is a phishing or trojan PDF. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The presence of external URIs and compromised upload links indicates a likely attempt to lead users to malicious sites for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://drafthe.ru/uplcv?utm_term=nova+launcher+galaxy+s20 PDF link annotation
    • http://mathcountsoutreach.org/userfiles/file/velizexuzubemoxiti.pdfIn PDF document text
    • https://sitarasign.ir/data/file/93398565754.pdfIn PDF document text
    • http://chamdure.com/DATA/files/titiditiwobidereso.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/161402d9dd8ca9---tulisijetegavepupuxopojam.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f4e5abaa1a---tadenutiwewowubavatafupug.pdfIn PDF document text
    • https://torbay.ru/images/uploads/file/29570064675.pdfIn PDF document text
    • http://infas.cz/images/wiswig/file/38353525061.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1613f5161b0542---59370266171.pdfIn PDF document text
    • http://maremio.ru/admin/ckfinder/userfiles/files/46673987163.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/161362bcc16023---makodibobosudiruvimitexab.pdfIn PDF document text
    • http://bellamy.tw/uploads/files/202109030825534729.pdfIn PDF document text
    • https://steammining.com/userfiles/file/madigazunitolanuj.pdfIn PDF document text
    • http://4els.ru/uploads/images/files/2970871778.pdfIn PDF document text
    • http://dichvugiayphep.biz/upload/ck/files/genegiwofesudubo.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/e18954c834adc6f2f8fc400180ccef0e/tomepivumogoj.pdfIn PDF document text
    • https://korovin.org/site/img_ufiles/fiwepiberof.pdfIn PDF document text
    • http://szm.hu/userfiles/file/vober.pdfIn PDF document text
    • https://kimtuong.vn/isc/public/files/fckupload/file/joluwaki.pdfIn PDF document text
    • http://emilygrilltogo.com/uploads/files/vekasifopogiko.pdfIn PDF document text
    • http://studiocalderini.it/userfiles/files/todopuwatisimakubupukoj.pdfIn PDF document text
    • https://tecnomatec.cl/upload/file/62470456998.pdfIn PDF document text
    • http://portaldeaquidauana.com.br/ckfinder/userfiles/files/58723957967.pdfIn PDF document text
    • http://theponghop.com/upload/files/werusod.pdfIn PDF document text
    • http://parcroyale.hk/userfiles/dovubotobegobu.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ba2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA2D 10920 bytes
SHA-256: 78c7fbe31c5266f85c9bcdff7fc4102555b2f322c5461c8cde4dadad32d11e96
font_01_sfnt_off0000d399.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD399 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ebab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBAB 16468 bytes
SHA-256: 15d1f802e47994d3128915fd0f3b5274d1e69146f8e0396f71f53a165c30f57c

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